state Newton's three laws of motion. Give one example each to explain the first and third laws.
Answers
first law state that if a body is in rest it will remain in rest till an external force is applied on the body
second law state that force is directly proportional to mass and acceleration
third law states that every action has an equal and opposite reaction
Answer:
Newton’s First Law of Motion
The first law of motion simply means that things cannot start, stop or change direction all by themselves. It requires some force from the outside to cause such a change. This property of massive bodies to resist changes in their state of motion is called inertia. Newton’s first law is also known as the law of inertia.
Newton’s Second Law of Motion
The second law of motion describes what happens to the massive body when acted upon by an external force. The law states that the force acting on the body is equal to the product of its mass and acceleration.
Mathematically, we express the law as follows:
f∝dP/dt
⇒f∝mv−mut
⇒f∝m(v−u)t
⇒f∝ma
⇒f=kma
Where k is the constant of proportionality and it comes out to be 1 when the values are taken in SI unit. Hence the final expression will be,
F=ma
Newton’s Third Law of Motion
The third law of motion describes what happens to the body when it exerts a force on another body. The law states that when two bodies interact, they apply force on each other that are equal in magnitude and opposite in direction. A force resting on a table applies a downward force equal to its weight on the table. According to Newton’s third law, the table applies an equal and opposite force on the book. This force occurs because the book slightly deforms the table, as a result, the table pushes back on the book like a coiled spring. Newton’s third law of motion implies the conservation of momentum.
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